Version: 0.6.1 (SVN r1304)
When SMplayer is full screen, the control bar at the bottom gets doubled when attempting to pull up Window XP's autohidden taskbar. A picture is here:
i'd be willing to help find/fix this issue if you'd like. i'm pretty solid on the base code for mplayer and smplayer, but not so much on QT (which i suspect is involved in this issue).